diff --git a/build.gradle b/build.gradle
index 284ac06..b4bd5ac 100644
--- a/build.gradle
+++ b/build.gradle
@@ -21,7 +21,6 @@
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     // a dependency on Jackson Databind
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.11.4'
-    
     implementation 'io.vertx:vertx-core:3.5.3'
 }
 
diff --git a/src/main/java/org/ntlab/acanthus_server/resources/HelloWorld.java b/src/main/java/org/ntlab/acanthus_server/resources/HelloWorld.java
index f9b173d..94eb0be 100644
--- a/src/main/java/org/ntlab/acanthus_server/resources/HelloWorld.java
+++ b/src/main/java/org/ntlab/acanthus_server/resources/HelloWorld.java
@@ -1,15 +1,24 @@
 package org.ntlab.acanthus_server.resources;
 
 import org.springframework.stereotype.Component;
+import org.springframework.web.bind.annotation.RequestMapping;
 
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
+import java.util.Date;
 
+@RequestMapping(produces="application/json;charset=UTF-8")
 @Component
 @Path("hello_world")
 public class HelloWorld {
+    long msec;
+    long responsetime;
+
     @GET
     public String getHelloWorld() {
-        return "Hello World!!!";
+        Date date = new Date();
+        this.responsetime = date.getTime()-this.msec;
+        this.msec=date.getTime();
+        return "Hello World!!!反応時間:"+this.responsetime+"time:"+this.msec;
     }
 }